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Note 9 - Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
2018
    
2017
  
Weighted average common shares outstanding basic earnings per share
    
6,495,597
      
6,375,848
  
Effect of potential common share issuance:
                
Stock options
    
-
      
11,616
  
                 
Weighted average common shares outstanding
                
Diluted earnings per share
    
6,495,597
      
6,387,464